Terrafrom reading yaml file and assign local varible - terraform

Question

I am trying to read the yaml file and assign value to local variable, below code giving `Invalid index' error. how to fix this error message?
YAML file server.yaml
vm:
- name: vmingd25
- system_cores: 4
Code block
locals {
vm_raw = yamldecode(file("server.yaml"))["vm"]
vm_name= local.vm_raw["name"]
vm_cpu = local.vm_raw["system_cores"]
}
Error message
╷
│ Error: Invalid index
│
│ on main.tf line 16, in locals:
│ 16: vm_name= local.vm_raw["name"]
│ ├────────────────
│ │ local.vm_raw is tuple with 10 elements
│
│ The given key does not identify an element in this collection value: a number is required.
╵
╷
│ Error: Invalid index
│
│ on main.tf line 17, in locals:
│ 17: vm_cpu = local.vm_raw["system_cores"]
│ ├────────────────
│ │ local.vm_raw is tuple with 10 elements
│
│ The given key does not identify an element in this collection value: a number is required.

Answer 1

Your YAML is equivalent to the following JSON:
{
"vm": [
{
"name": "vmingd25"
},
{
"system_cores": 4
}
]
}
As you can see the vm element is a list of objects because you are using the - character. This means you need to either:
Change you YAML to remove the - list definition. e.g.
vm:
name: vmingd25
system_cores: 4
This would turn the list into a dictionary so you could index with the keys as you have done in your question. OR
If you cannot change the YAML then you will need to index with an integer. This might work if your YAML never changes but is definitely not recommended.